In QGIS, as in many other database and GIS systems, a NULL value represents the absence of a value. It indicates that the data is missing or unknown for a particular field in a dataset. Here’s how you can do it step-by-step:

Here’s a step-by-step guide on how you might use the BETWEEN operator in QGIS:

In QGIS, the “AND” operator is used within expressions to ensure that multiple conditions must be true for the expression to return true. Here’s how you can use the “AND” operator in different contexts in QGIS

The ILIKE operator in QGIS is used for case-insensitive pattern matching. It functions similarly to the LIKE operator but does not consider case, making it particularly useful when dealing with data where case consistency might not be guaranteed. Here’s how you can use the ILIKE operator in QGIS:

In QGIS, the LIKE operator is used in expressions to match a pattern in a string. This operator is often used in queries or expressions for filtering data. Here’s how to use the LIKE operator in QGIS:

Changing the projection or the Coordinate Reference System (CRS) of your QGIS project. Here’s how you can change the CRS in QGIS:

How do I change the default colour of the canvas in QGIS

Learn how to effectively use the Field Calculator to manipulate and classify data based on specific conditions. Whether you’re a GIS professional or a hobbyist, this post will walk you through the essentials of using ‘if’ functions and ‘case’ statements for data analysis in QGIS.